Telegraphone.



PATENTED DBO.. 10, 1907.

V. POULSEN. -TELBGRAPHONEl APPLICATION FILED SBPT.29. 1902. BENEWED'MAY2, 1907.

2 SHEETS-SHEET 1.

gom/1to0@ 7m Soznm y @WLM/w :maa M4 PATENTED DEG.`10, 1907.

V. POULSBN. l v

TELBGRAPHONE.

` The surface of the sheet may be perfectly UNITED sTATEs' PATENToEErcE.

.VALDEMAR POULSEN, OF COPENHAGEN, DENMARK, ASSIGNOR TO AMERICANTELEG-RAPHONE COMPAN Y, A CORPORATION OF THE DISTRICT OF COLUMBIA.

TELEGRAPHONE.

Specification of- Letters Patent.

Patented nee. 1o, 1907.

Application tiled September 29. 1902, Serial Np. 125.148. Renewed Hay 2,1907. Serial No. 371.455.

To all 'whom tt may concern.'

Be it known that I, VALDEMAR PoULsEN, a subject of the King of Denmark,residing at Copenhagen, Denmark, have invented certain new and usefulImprovements in Telegraphones, of which the following is a full, clear,and exact description.

This invention relates to telegraphones, the object being to provide aform ofinstrument which is capable of recording a comparatively longmessage or speech in or on a comparatively small, compact and easilyhandled recording bod i It is also an object of the invention to producea recording device which will render it possible to run the machine at aslower` speed than has been heretofore possible without diminishing theintensity of the record or the distinctness with which it is reproduced.

Another object of the inventlon is to provide a recording body of suchform that it can be easily transferred, sent by mail or other carrier,easily adjusted to, and removed from, the telegraphone, and generallyhandled, without injury.

A still further object is to provide means for more rapidly eiiacing arecord' from the recording body than is possible by methods heretoforepracticed.

All forms of the telegraphone heretofore produced have embodied arecording body in the form of a narrow elongated strip, such as a wireor ribbon of steel, or other para-mag- 4 netic material. The'material inthis form requires either spools upon which it is -wound and unwound topass before the recording magnet, or a rotating cylinder upon which thewire is permanently filed. A machine in either of these forms isnecessarily large for a given capacity. Experiments have nowdemonstrated the fact that it is possible to record the electricalundulations created in the telephone circuit in a body of magneticmaterial inthe form of a sheet, and to make such record in closelyadjacent, parallel lines.

smooth, in which case the magnet would be guided thereover by suitablemechanical devices, or it may be provided with grooves or corrugationswith which the poles of the. magnet mechanically engage to properlyguide the magnet over the surface. The sheet may obviously be used invarious forms, each of which will require its own particularconstruction of instrument erly direct the magnet over its surface. Forinstance, the sheet may be in the form of a cylinder or cone, eitherwith or Without a joint; it may be a fiat sheet like a postal card, orit may be a disk. In the case of the cylinder or cone the magneticrecord would be traced upon its surface in a screw-line, and in the caseof a fiat sheet the record would be traced in straight lines, while inthe case of a disk the tracing would be in the form of a spiral, leadingfrom the edge towards the center. The recording body must be made ofsteel, nickel or some other magnetizable material. As a material forsaid forms of recording body can be used the different kinds of steel,described in the magnetic literature as well as any material whichpossesses high remanence, permanence, permeability or other propertysuitable for telegraphonic purposes. (For instance molybdaen-steel etc.)The accompanying drawing is illustrative of the invention and consistsofthe following figures: Y

Figure 1 is a view of a somewhat conventional form of telegraphone; Fig.2 is a similar view of a different form of machine; Fig. 3 shows twosectional views of the improved magnets, single and double pole; Figs.4, 5, 6 and 7 are views of different forms of the recording body, andFig. 8 illustrates the im roved eiacing device. i

n Fig. l, a and b are standards supporting a shaft c, upon which ismounted a carrier d for the recording body e of the telegraphone. Thecarrier is a cone, and the recording body,

which is a cylinder, is put on it, as shown 1n f the drawing. The shaftwith the carrier is adapted to be rotated from a suitable source ofpower through the medium of a pulley f.

The recording and reproducing magnet is indicated at s and is adapted tobe moved lengthwise of the cylinder, as a piece of a nut h2, with whichit 1s in a solidcollection, is moved on by a screw-thread on the shaftc. The carrier d may also be adapted to wear the recording body shown inFig. 4. This is a very thin sheet of steel, nickel, or otherpara-magnetic material, rolled into cylindrical form in such a way, thatthe joint is a sorewline. The carrier must then be a cylinder andprovidedwith something to keep fast the recording body. The cylinder,however, may be made without an,open

to prop--55 joint., in which case. it may also be of very thin materialor of heavier nmterial, as shown in Fig. l 'lhisla-st figure, however,more particularly illustrates a record carrier in cvhndrhral form havlngupon its surface, grodves r which are traversed by the poles of the`recording magnet in order to properly guide and feed it.

Special meclninism for recording upon a llat sheet. such' as shown inFig. 5 is not illustra-led, as it is not considered necessary since itcan be understood that the recording magnet can even be moved back andforth by hand across lhe face of such a sheet, but an arrangement ofguide rails and racks can easily be applied for this purpose.

Mechanism for using the form oll recording body shown in Fig. 6 isillustrated in Fig. 2. This, however, is conventional. 'lhe disk isindicated by 1* and is mounted upon a vertical axis g, rotated from asource of power through the pulley g. On the axis g is a )inion (12,engaging a large spur-gear 7L. Yheel l1I drives the screw-shaft 'ithrough the reducing bevel-gear 11.. Shaft carries the magnet s and isarranged in a radial position. As the disk vr2 is rotated on its axis g,the magnet is very slowly moved towards the center and thereforetraverses a spiral path.

When the recording body has a perfectly smooth surface, it may benecessary to adjustably mount the magnet, so that it may be slightlymoved to accurately locate its poles for reproducing a record which has)een previously made, because parallel magnetic lines of the record arevery close together and a slight displacement of the poles of the magnetin reproducing would result in indistinct reproduction or double speech.By means of a line screw the oles of the magnet can be adjusted lateraly to bring them accurately into the magnetized line. This is in Fig. 1done by means of a screw n. This screw has a cone, which Will press thearm p against the feather g. In this Way the distance between the nut hand the recording and reproducing magnet may be varied.

Fig. 3 illustrates the improved form of re cording and reproducingelectro-magnet, the essential feature of which is that the end of thepole which is presented to the recordingsurface is pointed, orterminates in a'surface of very small area compared with the diam- Theresult of this iseither a permanent. magnet or an electromagnet is used,but the present improvement consists in the use of a magnet having apole pieee sulliciently broad to cover a number of the magnetic recordlines, so that the obliteration can be quickly accomplished. The pole ofthe magnet may, in fact, beI broad enough to cover the entire length ofthe cylinder or sheet, in which case a single rotation of the cylinderor a single movement of the sheet past the pole would be sullieient toremove thc entire record. ln Fig. 1 is obliterated With along horse-shoemagnet indicated by o. Often is also used one or more single magnetsplaced one after another in the revolving direction. Fig. 8 shows thelpole of permanent magnet M applied to the 'surface of a cylinder andIspanning a plurality of the magnetic lines graphically represented at m.

llaving described my invention7 l claim:

1. A record receiving body for telegraphones consisting vof magneticmaterial in sheet form, in combination.with ymeans `for tracing magneticlilies throughout its` surface.

3. A record receiving body for telegraphones consisting of a sheet ofmagnetic material having a smooth surface, in combination with means fortracing lines of magnetism throughout its surface.

3. A record receiving body for telegraphones consisting of a sheet ofmagnetic material inthe form of a cylinder, in combination with meansfor tracing lines of magnetism throughout its surface.

4. A record receiving body for telegraphones consisting of a sheet ofmagnetic material in the form of a cylinder and having a smooth surface,in combination with means for tracing a screw-thread line of magnetismthereon.

5.. A record receiving body for telegra- 6. A phonogram consisting of asheet ofparamagnetic material containing a magnetic record of speech orsounds arranged thereon in lines covering its surface.

7. A phonogram consisting of a cylindrical surface of paramagneticmaterial' having traced thereon by electro-magnetism, a magnetic recordof speech or sounds extending throughout its surface.

8. A record receiving body for telegraphones, having a smooth .magnetichomogeneous surface and means for tracing contigu'4 ous magnetic linesupon said surface.

In witness whereof, I subscribe my s1gna ture, 1n presence of tWowitnesses.

VALDEMAR POULSEN.

Witnesses:

- CARL SCHAU,

J. HERM. CHRISTENSEN.

